Sunday, August 7, 2016

In 2013, US EPA determined that exposure due to vapor intrusion, also referered to as vapor encroachment, needed to be evaluated prior to closure of federal CERCLA sites. In response, many States now include vapor intrusion in site investigations for closure of LUST, LAST and voluntary cleanup sites run by the State. In practice, this has resulted in reassessment of numerous closed sites, and investigation of soil vapor on nearby sites.